AUDIO_INPUTS Table Layout for Rivendell

The AUDIO_PORTS table holds data concerning which configuration of the 
physical audio inputs.

FIELD NAME           TYPE              REMARKS
---------------------------------------------------------------
ID                   int(10) unsigned  Primary key, auto increment
STATION_NAME	     varchar(64)
CARD_NUMBER	     int(11) signed
PORT_NUMBER          int(11) signed
TYPE                 int(11) signed    0 = Analog, 1 = AES/EBU,
                                       2 = SP/DIFF
LEVEL                int(11) signed    Gain offset, in 1/100 dB
MODE                 int(11) signed    0 = Normal, 1 = Swap,
                                       2 = Left Only, 3 = Right Only